In the paper, a series of Na2O-CaO-Al2O3-SiO2 system glasses following similar compositions to the soda-lime-silicate float glasses and possessing more excellent physi-chemical properties were prepared with different Al2O3/SiO2 ratio. The structure of glasses have been studied by IR and density tests. The investigation of Al2O3/SiO2 on the performance was carried out by bending strength tests, linear dilatometry and chemical durability tests in aqueous and alkaline environment. The results showed that the number of no bridging oxygens decreased with increasing the Al2O3/SiO2 ratio, the glass network structure and density increased, which leading to enhance the bending strength, thermo-stability and chemical durability of glass.